John root



y y @fairen giet-ta datut @frn JOHN ROOT, OF NEW HAVEN,OONNEOTIOUTASSIGNOR TO HIMSELE AND MoLAZAN AND STEVENS, OF THE SAMEPLAGE.` y

Lette-S Para: No. macadam october 29, 1867.

IMPROVBD MACHINE FORl HEADING BOLTS.

TO ALL WHOM IT MAY OONOERN:

-Be it known that I, JOHN ROOT, of New Haven, in the 'county of NewHaven, and State of Connecticut, have invented a new Improvement inBolt-Heading Machines; and I do hereby declarethe following, when takenin connection with the ,accompanying drawings, and the letters ofreference marked thereon, to be a full, clear, and exact description ofthe same, and which said drawings constitute part of this specification,and represent, in

Figure 1, a top view,

Figure 2 a'side view, and in Figure 3 a vertical central section of theoperative parte of the machine.

This invention relates to an improvement in machines for forging theheads of bolts, and consists in the peculiar arrangement and operationof the several dies with the mechanism combined therewith, so as toraise the bolt during the operation of heading, so that the head may beformed without the usual burr produced in other heading machines.

In order to the clear understanding of my invention, as well as t"oenable others to construct the same, I will proceed to a descriptionthereof, as illustrated in the accompanyingV drawings.

A is the bed-plate, upon which the mechanism'is placed, and is supportedupon legs B, or otherwise. C is a driving-shaft, supported in bearingsDbeneath the bed-plate, and caused to revolve bythe application of powerthereto, in any convenient manner. EE and F F are four die-holders,arranged to slide to and from a common centre by the operation of a cam,G, upon `the shaft, acting upon levers H H andI I, as seen in figs. 2and 3, which said levers are pivoted to the bed-plate at a, and extendup through, so that their upper ends move their respective slides to andfrom the centre. Each -of the said die-carriers is provided with dies ee and ff.V In the centre of the machine, that is to sayin a centrecommon to the four dies, is arranged a holding-die, J. The saidholding-die J is formed in two parts, one of' which is' firmly securedto the bed-plate, and the other part movable to and from the rst part,as denoted in red, fig. 1. The die-holder has a die-seat, formed half ineach part, to correspond to the size ofand so as to grasp and holdfirmly the rod or bolt to be headed. The said die is operated by asliding bar, c, arranged to move upon the bed-plate, as denoted in redin said fig. 1, and upon the inside of the said bar is an incline, CZ,which bears against the looseV part of the holding-die, so'that when thebar c is drawn out, as denoted in red, the holding-die will be opened,and when again the bark is moved in,

to the position denoted in black, the incline d will close the die.Therefore, when the die is open, and the boltv to be headed insertedtherein, and the bar c moved inward to close the die upon the bolt, itwill be Vrmly held Within the die. In an upright supporting frame, L, isarranged another die-carrier, M, operated to move vertically by a cam,N,on the'shaft O through a lever, O, and connecting-rodP, and the saiddie-holder has attached to itt-'al vertical die, which is arrangedcentrally over the holding-die J, as seen in figs. 2 and 3, the undersurface of the said die being formed to correspond to the shape of the'surface of the head required to be formed.- Beneath the-bed-plate, andas seen in iig. 3, is arranged a spring, S, denoted in blue, fig. 1, sothat the bolt, when inserted through the holding-die, will rest upon thesaid spring, as denoted in fig. 3, the tendency of the' said springbeing to force the bolt upward.

The operation of the machine is as follows: The bolt is rst placed andgrasped in the die-holder J, its lower end resting upon the spring S,the shaft C then caused to perform one revolution, in which the die mrststrikes upon and upsets the metal, then'eithertwo of the dies e e and ffin their turns come forward. and com`V press the head into the formcorresponding to the form of the said dies. The upsetting-die misbrought a second time down on to the head, and raised therefrom. Thisnecessarily and unavoidably leaves more or less of a burr around thelower end of the head. To avoid this, when the several dies haveperformed one operation, the holding-die is opened and the spring Sforces the bolt up, as denoted in red, in which position the dies e eand ,ff are again forced up against the head, and the under surface ofthe head being so far raised above the holdingA die, the said dies e eandff strike and compress the burr into the head. Then the diem comesdown again upon the head, driving it hard down upon the holding-die, andso on, continuing the operation until the perfect head is formed.

It may be here observed that the design of this machine is to' producebolts as an article of manufacture. These are formed oi' a certainspecified length, so that the consumer may weld the headed blank upon arod to produce the bolt of the length required; therefore the spring Srequires no adjustment, as might at first appear from making bolts ofdifferent lengths.

I do not wish to be understood as broadly claiming four forging-dies,combined with an upsetting-die, for th'e purpose of forging bolt-heads,hut what I do claim, and desire to secure by Letters Patent, is-

The arrangement of the forging-dies e eandff, the upsetting-die m, andthe holding-die J, in combination with the mechanism for operating thesame, and the spring S, all constructed so as to operate substantiallyin i the manner herein set forth. v

JOHN ROOT.

Witnesses:

JOHN E. EARLE, JOHN H. SHUMWAY.

